Stamps of German Democratic Republic, 100 years Carl-Zeiss-Foundation, Jena issue

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1989, May 16 100 years Carl-Zeiss-Foundation, Jena issue unwmk (no perf info)
Stamps_of_Germany_%28DDR%29_1989%2C_MiNr_3252.jpgStamps_of_Germany_%28DDR%29_1989%2C_MiNr_3253.jpg
- 50pf multi Interference microscope JENAVAL Interphako
- 85pf multi Twice-coordinates-gauge ZKM 01-250 C

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